Defensive publication

ABSTRACT

THIS APPLICATION DESCRIBES A SUBSTANTIALLY WATER-INSOLUBLE, CROSS-LINKED SEQUESTERING RESIN HAVING A PLURALITY OF UNITS IN ARBITRARY SEQUENCE SELECTED FROM THE GROUP CONSISTING OF   -(CH2)2-N(-)-CH2-N(-)-(CH2)2-, -(CH2)2-N(-CH2-COOH)-,   AND -(CH2)2-NH-   WHEREIN AT LEAST 15% OF THE UNITS ARE   -(CH2)2-N(-CH2-COOH)-   AND ABOUT 15% OF THE UNITS ARE   -(CH2)2-N(-)-CH2-N(-)-(CH2)2-   ETHYLENEIMINE IS FORMED INTO A LOW MOLECULAR WEIGHT BRANCHED PRE-POLYMER IN AN ACIDIC AQUEOUS SOLUTION. THIS IS THEN CYANOETHYLATED AND CROSS-LINKED IN A STRONGLY ACID SOLUTION OF FORMALDEHYDE AND HYDROCYANIC ACID. THE RESULTING CROSS-LINKED POLYMER IS HYDROLYZED TO PROVIDE ACTIVE SEQUESTERING GROUPS&gt;N-CH2-COOH ON THE CHAIN.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. 'lfie Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED DECEMBER 4, 1973 L 00011 ,and L JHa J door: and about 15% of the units are L J Ethyleneimine is formed. into a low molecular weight branched pre-polymer in an acidic aqueous solution. This is then cyanoethylated and cross-linked in a strongly acid solution of formaldehyde and hydrocyanic acid. The resulting cross-linked polymer is hydrolyzed to provide active sequestering groups N-CH CO0H on the chain. 

